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Old March 19, 2012   #4
carolyn137
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Join Date: Jan 2006
Location: Upstate NY, zone 4b/5a
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http://www.howstuffworks.com/question357.htm

If you Google Roundup there are so many links it will make your head spin, but I chose the one above to make a simple point.

Glyphosphate kills only plants of all kinds, be they weeds, poison ivy, yes tomato plants, or whatever, that are growing plants b'c it inhibits an enzyme that's necessary for plant growth.

It's the most commonly used herbicide in the world and lots of data is known about it if you want to do a search.

I've used it a couple of times with excellent results but you want to be sure to use it when there is no wind drift. One time I used it when a group of Master Gardeners were coming to my tomato field for a demonstartion day and it was the easiest way to get rid of the weeds in betwen the rows.

And the second time was here where I now live and no problems at all, As I recall it has a short half life so the glyphosphate doesn't stay long in the environment as do some other herbicides.
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